Slaty Vireo

The slaty vireo (Vireo brevipennis) is a species of bird in the family Vireonidae, the vireos, greenlets, and shrike-babblers. It is endemic to Mexico. == Taxonomy and systematics == The slaty vireo was originally described in 1858 as Neochloe brevipennis. The genus Neochloe was later merged into the present Vireo. The further taxonomy of the slaty vireo is unsettled. The IOC, AviList, and BirdLife International's Handbook of the Birds of the World assign it two subspecies, the nominate V. b. brevipennis (P.L. Sclater, 1858) and V. b. browni (Miller, AH & Ray, 1944). The Clements taxonomy does not recognize V. b. browni. This article follows the two-subspecies model. == Description == The slaty vireo is 11.5 to 12 cm (4.5 to 4.7 in) long; one individual weighed 11.8 g (0.42 oz) and two others 12.3 g (0.43 oz). "Few vireos possess such striking plumage as [the] Slaty Vireo", whose appearance is unique in its range. The sexes have the same plumage. Adults of the nominate subspecies have an olive green crown. They have blackish lores on an otherwise slate gray face. Their upperparts are slate with an olive green tinge on the rump and uppertail coverts. Their wing coverts are…